stem up or down in definition?

[Quintijn Hoogenboom]

Mats helped me tremendous with a "tamtam" mode.

I now redefine notes like:

drumPitchNames = #'(
   (t . lefttenor)
   (T . righttenor)
   (b . bass)
   (B . rightbass)
   )


#(define mydrums '(
   (lefttenor   default   "marcato"     2)
   (righttenor  default   #f            1)
   (bass                cross     "open"        0)
   (rightbass   xcircle   "stopped"     -1)
   ))

I encountered strange problems (which were before on this list I believe)
that PDF output could not be found. It seems this was caused by a undefined
note (I tried to use r for rest, but it was not in the list).

After define (r . rest) and (rest rest) it worked.

Two other questions: 

1. can I force stem up or stem down in the defitions above?
2. can I include a fixed liric for each note? I would like to have T
(righttenor) to have stem up and "T" below the note, likewise t (lefttenor)
stem down and t above.

Again thanks a lot for helping,

Quintijn